[AArch64 array_mode 2/8] Remove VSTRUCT_DREG, use BLKmode for d-reg aarch64_st/ld...

[AArch64 array_mode 2/8] Remove VSTRUCT_DREG, use BLKmode for d-reg aarch64_st/ld expands

	* config/aarch64/aarch64-simd.md
	(aarch64_ld2<mode>_dreg VD & DX, aarch64_st2<mode>_dreg VD & DX ):
	Change all TImode operands to BLKmode.
	(aarch64_ld3<mode>_dreg VD & DX, aarch64_st3<mode>_dreg VD & DX):
	Change all EImode operands to BLKmode.
	(aarch64_ld4<mode>_dreg VD & DX, aarch64_st4<mode>_dreg VD & DX):
	Change all OImode operands to BLKmode.

	(aarch64_ld<VSTRUCT:nregs><VDC:mode>): Generate MEM rtx with BLKmode
	and call set_mem_size.
	(aarch64_st<VSTRUCT:nregs><VDC:mode>): Likewise

	* config/aarch64/iterators.md (VSTRUCT_DREG): Remove.

From-SVN: r227782